Service Manual

13
Building Management System (BMS)
All water heaters with ICON Systems can be equipped with a gateway kit that will facilitate a Building
Management System (BMS) connection to Modbus or Bacnet
®
. This kit is sold separately and is not
factory installed. A full installation, operation, and troubleshooting manual is provided with the
gateway kit.
CAUTION
Before beginning any Troubleshooting operations listed below, please note that the gateway kit and BMS may
need to be disconnected from the heater. Please ensure this has been completed before proceeding with any
troubleshooting operation that may be impacted by settings in the BMS.
BMS Mapping
Map Descriptor
Name
Modbus
Register
Read/Write
BACnet
Object ID
Note
Demand source
00006
Read
001
Current demand source:
0 = Unknown
1 = No source demand
2 = CH
3 = DHW
4 = Lead Lag slave
5 = Lead Lag master
6 = CH frost protection
7 = DHW frost protection
8 = No demand due to burner switch (register 199) turned off
9 = DHW storage
10 = Reserved
11 = Warm weather shutdown
12 = Hot standby
Firing rate
00008
Read
002
Actual firing rate (% or RPM)
Fan speed
00009
Read
003
RPM
Flame signal
00010
Read
004
0.01V or 0.01 µA precision (0.00-50.00V)
Tank temperature
sensor
00012
Read
005
-40˚-130˚ (0.1˚C precision)
Appliance setpoint
00017
Read
006
-40˚-130˚ (0.1˚C precision)
Burner status
00032
Read
007
0 = Disabled
1 = Locked out
2-3 = Reserved
4 = Anti-short cycle
5 = Unconfigured safety data
6-33 = Reserved
34 = Standby Hold
35 = Standby Delay
Lockout code
00034
Read
008
0 = No lockout
1-4096
Appliance status
00080
Read
009
0 = Unknown
1 = Disabled
2 = Normal
3 = Suspended
DHW priority count
00082
Read
010
Countdown of time when DHW has priority over CH (secs).
Applicable when DHW priority time is enabled.
Burner run time
00130/00131
Read
011
Hours
Controller cycle count
00142/00145
Read
012
0-999,999
Controller run time
00144/00145
Read
013
Hours
Alarm reason
0035
Read
014
0 = None
1 = Lockout
2 = Alert
3 = Other
DHW setpoint
0453
Read/Write
015
40˚-130˚ (0.1˚C precision)
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